Access to XMLHttpRequest at ‘file:///C:/Users/Administrator/Desktop/test/AJAX/demo_test.txt‘

请求模拟数据报错： Access to XMLHttpRequest at ‘file:///C:/Users/Administrator/Desktop/test/AJAX/demo_test.txt’ from origin ‘null’ has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.

解决：
1、右键chrome，选择属性，在“快捷方式”下的“目标”中添加" --allow-file-access-from-files"(最前面有个空格)，重启chrome即可
2、复制项目的路径，在浏览器上重新打开